Single Missing Point

First Algorithm

The first single missing point algorithm addressed hourly temperature and provided a corrected value by taking the average of the maximum and minimum observed temperature for that hour recorded at the following time stamp (as described here).

Test data has been taken from March 2008. On each day for all stations the “original” hourly temperature has been set to a missing value -32767 for the times 05:00, 11:00, 17:00 and 23:00 UT and the original value is kept for reference. The results of the algorithm are then compared to the original data:

Good results are obtained. Note the points at -99.9 arise due to this value being present in the original data record (and they are not a result of the algorithm).